Men's Sapphire Luminous Rotatable Bezel Stainless Seel Band Black Dial Waterproof Quartz Sport Watches Synthetic-sapphire mirror,scratch resistant; Unidirectional rotatable bezel,set time for diving; Luminous,more convenient to see the time in the evening 316 stainless steel watch band,it's comfortable to wera; 30 ATM waterproof,swimming, diving and snorkeling is secured.